With a shallow epicenter and extraordinary intensity

numerous secondary mountain hazards

including landslides and debris-flows

were triggered by the "8·30" earthquake occurred at Huili County

Sichuan Province.Nuozha gully

one of the tributary of Jinsha River

located in the southernmost of Huili County.The gully experienced a large number of rock-falls

landslides and collapsed slopes induced by the earthquake

which offered sufficient loose materials for the debris-flow.Furthermore

the right branch of the gully has a very large catchment area

which provides the energy and water source for possible outburst of debris-flow.Based on historic documents and field scouting

the downward and headwater erosion of Nuozha Gully

enhanced by downward erosion of Jinsha River

were the leading factors for reduced slope front resistance

resulting in unstable slopes and increasing failures in the upstream.The risks and trends of geohazards were assessed for the gully.Geotechnical engineering

including check dams

debris dam

as well as ecological measures like forest planting

were recommended for controlling debris-flow of Nuozha gully.